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Day 12 but faster
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Julius 2021-12-12 13:12:38 +01:00
parent 148f240696
commit b3434735e6
Signed by: j00lz
GPG key ID: AF241B0AA237BBA2
1 changed files with 19 additions and 103 deletions
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122
src/day12.rs
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@ -26,98 +26,15 @@ impl Day for Day12 {
}
fn part1(&self) -> anyhow::Result<String> {
fn get_all_paths(caves: &HashMap<String, Cave>, complete_paths: &mut Vec<Vec<String>>, current_path: &Vec<String>, current_cave_idx: &str) {
if current_cave_idx == "end" {
complete_paths.push(current_path.clone());
return;
}
let current_cave = caves.get(current_cave_idx).expect("This cave does not exist!").clone();
for connected_cave in current_cave.connections {
let current = caves.get(&connected_cave).unwrap();
match current.cave_type {
CaveType::Small => {
if current_path.iter().find(|&cave_pair| cave_pair == &connected_cave) != None {
continue;
}
}
_ => (),
}
let mut new_path = current_path.clone();
new_path.push(connected_cave.clone());
get_all_paths(&caves, complete_paths, &new_path, &connected_cave);
}
}
let mut complete_paths = Vec::new();
let current_path = vec!["start".into()];
get_all_paths(&self.0, &mut complete_paths, &current_path, "start".into());
Ok(format!("{}", complete_paths.len()))
let m = HashMap::new();
Ok(format!("{}", self.search("start", &m, true)))
}
fn part2(&self) -> anyhow::Result<String> {
let mut small_caves_thing: HashMap<Vec<String>, Vec<String>> = HashMap::<Vec<String>, Vec<String>>::new();
fn get_all_paths(caves: &HashMap<String, Cave>, complete_paths: &mut Vec<Vec<String>>, current_path: &Vec<String>, current_cave_idx: &str, small_caves_thing: &mut HashMap<Vec<String>, Vec<String>>) {
if current_cave_idx == "end" {
complete_paths.push(current_path.clone());
return;
}
let current_cave = caves.get(current_cave_idx).expect("This cave does not exist!").clone();
let small_caves = {
let e = small_caves_thing.entry(current_path.clone()).or_insert(small_caves_visited_at_least_twice(caves, current_path));
e.clone()
};
for connected_cave in current_cave.connections {
if connected_cave == "start" {
continue;
}
if !small_caves.is_empty() {
let current = caves.get(&connected_cave).unwrap();
match current.cave_type {
CaveType::Small => {
if !(small_caves.len() == 1 && small_caves[0] != connected_cave) {
continue;
}
}
_ => (),
}
}
let mut new_path = current_path.clone();
new_path.push(connected_cave.clone());
get_all_paths(&caves, complete_paths, &new_path, &connected_cave, small_caves_thing);
}
}
let mut complete_paths = Vec::new();
let current_path = vec!["start".into()];
get_all_paths(&self.0, &mut complete_paths, &current_path, "start", &mut small_caves_thing);
Ok(format!("{}", complete_paths.len()))
let m = HashMap::new();
Ok(format!("{}", self.search("start", &m, false)))
}
}
fn small_caves_visited_at_least_twice(caves: &HashMap<String, Cave>, current_path: &Vec<String>) -> Vec<String> {
let mut small_cave_indices = HashMap::new();
for cave_name in current_path {
let c = caves.get(cave_name).expect("how?");
if c.cave_type == CaveType::Small {
let e = small_cave_indices.entry(cave_name).or_insert(0);
*e += 1;
}
}
return small_cave_indices.iter().filter(|(_, &b)| b > 1).map(|(&a, _)| a.clone()).collect();
}
#[derive(Ord, PartialOrd, Eq, PartialEq, Copy, Clone)]
enum CaveType {
Large,
@ -153,23 +70,22 @@ impl Cave {
impl Day12 {
fn search(&self, cur: &str, had: &HashMap<String, i32>, part1: bool) -> i32 {
let mut had = had.clone();
if had.values().any(|&i| i > 0) || part1 {
if had.values().any(|&i| i > 1) || part1 {
if had.contains_key(cur) {
return 0;
}
}
if cur == "start" && had.contains_key("start") {
return 0;
}
if cur == "end" {
return 1;
}
if cur.chars().all(|x| x.is_lowercase()) {
let n = self.0.get(cur).unwrap();
if n.cave_type == CaveType::Small {
let e = had.entry(cur.into()).or_insert(0);
*e += 1;
}
let n = self.0.get(cur).unwrap();
return n.connections.iter().map(|c| self.search(c, &mut had, part1)).sum::<i32>();
}
}
@ -237,12 +153,12 @@ start-RW";
Ok(())
}
// #[test]
// fn part1_real() -> anyhow::Result<()> {
// let d = Day12::init(crate::load_input("12")?)?;
// assert_eq!("4885", d.part1()?);
// Ok(())
// }
#[test]
fn part1_real() -> anyhow::Result<()> {
let d = Day12::init(crate::load_input("12")?)?;
assert_eq!("4885", d.part1()?);
Ok(())
}
#[test]
fn part2_test_1() -> anyhow::Result<()> {
@ -259,12 +175,12 @@ start-RW";
}
// These are very slow, so they are commented out.
// #[test]
// fn part2_test_3() -> anyhow::Result<()> {
// let d = Day12::init(INPUT_3.to_string())?;
// assert_eq!("3509", d.part2()?);
// Ok(())
// }
#[test]
fn part2_test_3() -> anyhow::Result<()> {
let d = Day12::init(INPUT_3.to_string())?;
assert_eq!("3509", d.part2()?);
Ok(())
}
#[test]
fn part2_real() -> anyhow::Result<()> {